Balancer for three-phase electrical systems.



A. H. PIKLER.

BALANGBR FOR THREE-PHASE ELECTRICAL SYSTEMS. APPLICATION FILED NOV. 29, 1911.

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UNITED STATES PAQTENT @FFIGE,

ARMIN HENRY PIKLER, 0F MONTCLAIR, NEVJ JERSEY, ASSIGNOR TO CROGKER- WHEELER COMPANY, OF AMPERE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

BALANCER FOR THREE-PHASE ELECTRICAL SYSTEMS.

Specification of Letters Patent.

Patented Apr. 1, 1913.

Application filed November 29, 1911. Serial No. 663,057.

To all. IIFZZOIR- it may concern:

Be it known that LARMIN HENRY Pinnnn, a subject of the King of Hungary and a resident oi? il lontclair, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Balancers for Three-Phase Electrical Systems, of which the following is a specification.

The object of this invention is to provide means in a three-phase electrical system of distribution for establishing a neutral conductor at the point. of current consumption when by reason of the construction oi the generator or its remoteness, it is not practicable or desirable to lead the neutral conductor directly therefrom. A neutral so established enables lamps and other single phase apparatus for consuming current which require a lower voltage than exists between the main leads to be connected to the three-phase system and take care of any unbalance arising from the consumption of an excess of current from either of the main leads. There are various other uses of a balanced neutral so established which are not enumerated herein.

.ln the accompanying sheet of drawings which forms a part of this applicatimnthe figure illustrates a three-phase system with three transformers for establishing a neutral in accordance with my invention.

A hreephase generator (i supplies three phase conductors ii C. Branches from these conductors are led to windings on three transformer cores D E l which preferably form three independent closed magnetic eircults, and thence joined to term neutral conductor N. Each of the windin'; of each phase is subdivided into two halves, earn ha ing v two coils inany trans- "lie generator conductors which a supply the two coils to the neutral conductor the directions of the windings will be opposite. Thusin the transformer D the direction from the generator conductor A through the coil. H to the neutral is opp0- site to the direction from the conductor C through the coil M to the neutral conductor as shown by the arrows. Between the neutral )1 thus established and any or all ofthe other three conductors A, B and C of the system. lamps or other devices may be connected, forming a four-wire, three-phase distribution as indicated in the drawin The loads so connected to the different phases may be equal or unequal, and any tendency to unbalance of their voltages is counteracted by the operation of my apparatus, because the two halves of the winding of each phase are interlinked with two different magnetic circuits; also because each magnetic circuit is interlinked with coils belonging to two different phases. At the same timethelinkages of each phase and of each magnetic circuit are different from those of any other.

It would naturally be supposed that it is necessary to subdivide each winding of threephase tanst'ormers into three parts and distribute them on the three magnetic circuits in order to obtain a proper balancing of the voltages with unequal loads on the diiterent phases. I have discovered, howeyer, and proved by actual experiments that it is sutlicient to have two coils for each of the three-phase windings, provided they are aranged in accordance with my in rention.

(that I claim as new and desire to secure by letter- Patent or the United States, is-

i. lhe combination with tl'iree-phase con din-tins, at three transformer cores, a branch tors having therein two coils in ser' on dii ferent transformer cores, the air of coils in each branch being on a di erent pair 01 transformer cores from the pair of coils in either of the other branches, and a neutral conductor to .Which each of the branch conductors is connected through its coils, sub stantially as described.

3.' The'comliiination with threephase eonductors, of three transformer cores, a branch from each of the three-phase conductors having therein two coils in series on different transformer cores, the pair of coils in each branch being on 'a diii'erent pair of trans former cores from the pair of coils in either of the other branches, and a neutral conductor to which each of the branch conductors is connected through its coils, the directions of windings of the two coils on each transformer core traced from their respective generator connections to the neutral conductor being opposite, substantially as de: scribed.

4. The combination with three-phase con-- ductors, of three transformer cores forming three independent magnetic circuits, a branch from each of the threaphase conductors having therein two coils in series on different transforn'ier cores, the pair of coils in each branch being on a different pair of transformer cores from the pair of coils in either of the other branches, and a neutral conductor to which each of the branch con-- windings connected to said conductors, each winding comprising two portions interlinked with two different magnetic circuits and each magnetic circuit being interlinked with portions of two different windings, the linkages of each magnetic circuit and of each Winding being different from those of any other, whereby a balancing of the voltages of the phases is obtained.

6. The combination with three-phase conductors, of three magnetic circuits and a winding connected to each of the three-phase conductors comprising two coils in series on different magnet-1c clrcults, the two cells of each winding being ona different pair of magnetic circuits from the two coils of either of the other windings. I y

Signed by me at East Orange, N. J., the 24th day of November, 1911.

A 'tltLlIN HENRY PIKLER.

lVit nesses Gnoncn K. Kerstin, Unannns L. PILGER, Jr. 

